Pump



C. L. EVAN S Oct. 20, i942.

PUMP

3 Sheets-Sheet l Filed March 5, 1940 Oct. 20, 1942a "llllll snm" ATTORIVEYS.

Oct 20, 1942- c. EVANS 2,299,315

PUMP

Filed March 5, 1940 5 Sheets-Sheet 3 IN VEN TOR.

' l BY A TTORNEYS.

Patented Oct. 20, 1942 lUNITED STATES PATENTv -OFFICE PUMP CarrollEvans, Tipton, Calif.

Application March 5, 1940, Serial No. 322,393

3. Claims.

y after more fully described and pointed out in the claims, it beingunderstood that changes may be made in the construction and arrangementof parts without departing from the spirit of the invention as claimed.l

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings:

Figure 1 is a central vertical section through the upper portion of apump embodying the present improvement.

Figure 1a is a similar view through the lower portion of the pump.

Figure 2 is a section on line 2 2, Figure la.

Figure 3 is a section on line 33, Figure la.

Figure 4 is a central vertical section through the upper portion ofanother form of pump.

Figure 4a is a similar view taken through the lower portion oi' saidpump.

Figure 5 is a section on line 5-5, Figure 4a.

Figure 6 is a section on line 6 6, Figure 4a.

Figure 7 is a central vertical section through another modification ofthe pump.

Figure 8 is a section von line 8-8, Figure '7.

Figure 9 is a section through another form of pump having the presentimprovement.

Detachably connected to and extending upwardly from the connector 4 isanother tubular stem I4 having a head I5 the upper portion of which isreduced in diameter to provide an annular shoulder I6 and this reducedportion is also formed with an annular groove I5. A valve in the form ofa disc or ring I1 is slidably mounted on the stem I4 and is heldnormally pressed against the seat I8 formed'by the upper surface ofconnector 4 so as normally to close the upper ends of the port 9. Acoiled spring I9 is mounted on stem I4 and thrust upwardly against headI5 and downwardly against the valve I1. Thus the valve is heldyieldingly to its seat.

A plunger rod has been indicated at 20 and is mounted to reciprocatewithin connector 4, stems III and I4, and heads IIand I5. An annularshoulder 2| is provided on the rod 20 within cylinder I and constitutesan abutment for a plunger head 22 which is screwed onto the rod 20 andagainst the flange and is provided with an annular shoulder 23 and anannular groove 24.

'I'he space between head I5 and plunger head 20 is normally closed by aseries of contacting washers 25 which are mounted for movement relativeto the rod 20 surrounded thereby and these washers, which have roundedouter edges,

Referring to the gures by characters of reference I designates the upperpump cylinder having an interiorly screw-threaded lower end 2 whichdetachably engages the reduced threaded upper portion 3 oi' a connector4. The lower portion of this connector is also reduced andscrew-threaded as at 5 and is eng-aged by the lower cylinder 6 of thepump. The lower end of cylinder 6'is closed by a bottom cap 1 having ascrew-threaded reduced portion 8 detachably seated in the cylinder. .f

Discharge ports 9 are extended through the connector 4 and extendingdownwardly from the connector between these ports is a tubular stem I0provided with a stationary head II the lower portion of which is reducedin diameter to pro-v vide an annular shoulder I2. This reduced portionis also formed with an annular groove I3.

are in turn engaged by an elastic sleeve 26 which is molded about thewashers and also about the reduced portions of the heads I5 and 20 so asto abut against the shoulders I 6 and 23 and iit within the grooves I1and 24. The external diameter of the sleeve is less than the internaldiameter of cylinder I in which it is located so that iluid is thus freeto iiow upwardly within the cylinder and past the sleeve.

That portion of the rod 20 Within the lower cylinder 6 is provided atits lower end with a lower plunger head 21 having an annular shoulder 28and an annular groove 29. This head is held to the rod 2II by means of anut 30 or the like so that it will move with the rod. A series otwashers 3I is mounted loosely on the rod and normally fills the spacebetween head 21 and head II. These washers, which have rounded edges,are surrounded by an elastic sleeve 32 which is molded on the washersand also around the heads 21 and II so as to iit snugly against theshoulders 28 and I2 and within the grooves 29 and I3.

The bottom cap 1 has an intake port 33 normally closed by a suctionvalve 34 which can be in the form of a ball held against displacement bya retaining ring 35 detachably engaging the cap and overlying a portionof the valve.

When the rod 26 is moved upwardly to the position shown in'Figures 1 andla the valve 34 is unseated so that fluid can ilow into the cylinder 6.When rod 29 is moved downwardly the liquid in the cylinder 6 is stoppedagainst downward tlow therefrom and is displaced upwardly by thedescending head 21. During this 'movement the sleeve 32 will stretch butthe washers to which the sleeve is molded will act as spacers as theyare moved apart, thereby preventing the sleeve from collapsing. At thesame time the washers which have been held spaced by the upper sleeve 26when the rod was moved upwardly. will move together. The descent of theplunger head 21 causes the displaced liquid to rise within the cylinder6 and ilow upwardly through ports 9 into the upper cylinder L'thisaction causing valve I1 to unseat. As soon as the upward stroke iscompleted valve I1 will reseat so that the raised liquid will be trappedin cylinder I. Consequently when additional charges of liquid aresubsequently forced successively into cylinder I, said cylinder willoverilow and the liquid passed from the outletprovided at the upper endthereof.

For the purpose or protecting the elastic sleeve from abrasion and fromthe action of deteriorating fluid, the pump may be constructed as shownin Figures 4 to 6 inclusive. In this modiiied structuce the pump is madeup of upper and lower cylinders 36 and 31 joined by connector 38 similarto connector 4 and provided also with a valve cap 39 at the bottom ofthe pump. In this modified structure a spring-pressed valve 49 normallycloses ports 4| in the connector and the plunger 42 is slidable within astem 42 extending upwardly from connector 38 and having a head 43.Another stem 44 is extended downwardly from the connector and has a head45. i

Instead of mounting a single elastic sleeve on that portion of the rodwithin the upper cylinder 42, an upper plunger head 44 is secured to therod and has one end of an elastic sleeve 45 molded therearound and alsoaround an intermediate head 46 in which the rod 42 is slidably mounted.This intermediate head 46, in turn,

is securedto a stem 41 extending upwardly from a lower intermediate head48 and an elastic sleeve 25a is molded at its upper end about the lowerend of intermediate head 48 and, at its lower end about the head 43.Washers 49 are located within the respective sleeves and on the rod,these sleeves being molded about the washers in such a manner that thesleeves can expand and contract and at the same time be held againstcollapse by the washers.

For protecting the two sleeves in the cylinder 36 there are providedjackets 50 and 5| secured at their lower ends -to the heads 43 and 46respectively. These jackets are placed around but are spaced from therespective elastic sleeves and project upwardly therebeyond, there beingan inturned ilange 53 at the upper end of each jacket and constituting aballle or retainer. Not only is each jacket spaced from the elasticsleeve therein but it is also spaced from the cylinder 36 and the areabetween the jacket and the elastic sleeve is adapted to be iilled with aheavy liquid indicated generally at 54. This liquid can partly fill theupper portion of the jacket as shown in Figure 4. v

That portion of the rod 42 within the lower cylinder 31 is similarlyequipped with heads, sleeves and jackets. An elastic sleeve is moldedabout and extends downwardly 'from the head 45=l and is also moldedabout and joined to d injury to the elastic 2,299,315 Y y .l an upperintermediate head 56. A tubular stem 51 is connected to this head 56 andis provided at its lower end with a head 58. This head, in turn, isconnected by an elastic sleeve 59, to the lower plunger head secured tothe lower end of rod 42. Washers 6I are mounted .on the rod within therespective elastic sleeves and serve to mold such sleeves againstcollapse during the operation of the pump.

Jackets 62 are secured at their lower ends to the heads 60 and 56respectively and extend around and are spaced from the elastic sleeves59 and 55 respectively. They are also spaced from the cylinder 31 andproject upwardly above the elastic sleeves where they are formed withinturned flanges or bames 63. The spaces between these jackets and theelastic sleeves are lled with heavy kfluid indicated at 64.

Obviously the pump shown in Figures 4 to 6 will function in the samemanner asthe one shown in Figures 1 to 3 inclusive but it has the addedadvantage of providing a protecting jacket for each elastic sleeve, eachjacket constituting a. container for a heavy protecting liquid wherebysleeves is prevented.

In the form shown in Figure 7 the pump includes a casing 65 having anintake cap or head 66 at its lower end. 'I'he pump rod 61 has a suitablevalve casing 68 at its lower end provided with outlet ports 69 and withan intake 19. A valve 1| in this casing serves to close the intake portsduring the up-stroke of the rod but to open it during the down stroke.To this valve casing is joined the upper end of a tubular plunger headl2. The lower end of this plunger head is reduced in diameter as at 13and molded about it is the upper end of an elastic sleeve 14. Thissleeve, which is spaced from casing 65, has its lower end molded aboutthe reduced upper-portion of the head 66. Spacing washers 15 aresurrounded by the elastic sleeve 14 which is molded therearound andthese washers are superposed,

about a suction tube 16. This tube extends from the intake ports 11 ofhead 66 upwardly into the head 12 where it is provided with a checkvalve 18 having a retaining cap 19. Notches or recesses are formed atthe centers of the washers 15, as shown particularly at in Figure 8V andthese are adapted to be filled with heavy lluid indicated at 8|. I'hisuid extends along the tube 16 and also within the space between thecasing 65 and the sleeve 14. Obviously when the rod 61 is reclprocated,sleeve 14 will be alternately stretched and retracted. Each up strokewill set up a suction within the head 12 and each down stroke willresult in upward displacement of the trapped fluid through the ports 69and above the heavy fluid 82 which is located around the head 12 andbetween sleeve 14 and the casing 65. With a structure such as shown inFigure 7 the elastic sleeve is protected both on its inner and outersurfaces by the heavy fluid, the uiddl suppleinenting the washers 15 toresist collapse of the sleeve when stretched.

Another type of pump embodying the present improvement has been shown inFigure 9. In this structure a pump cylinder has been shown at 83 and hasa valved intake port 84 and a valved outlet 85. 'I'he piston rod 86 ismounted for reciprocation in the cylinder and has a piston head 81 towhich is molded one end of an elastic sleeve 88. The other end of thesleeve is molded to the cylinder head 89 and washers 90 are mounted onrod 86 and within the sleeve so as to hold the sleeve against collapse.This sleeve is surrounded by a protecting body of heavy fluid indicatedat Il and this iluid can extend upwardly above the piston head 81 asshown.

What is claimed is:

1. In a pump the combination with a cylinder having a valved inlet and avalved outlet, of an expansible, sealed plunger in the cylindercomprising a rod mounted for reciprocation in the cylinder, a plungerhead carried by the rod, an imperforate elastic sleeve secured at oneend to the plunger head and anchored at its .other end to the cylinder,thereby to provide a sealed casing and a series of spacing washersmovably engaging and centered by the rod and surrounded by and joined tothe sleeve, said washers normally contacting and cooperating to lill thesleeve when in normal position. Y

2. In a pump the combination with a cylinder having a valved inlet and avalved outlet, of an extensible sealed plunger in the cylindercomprising a head, an imperforate elastic sleeve secured at one end toand closed by the head, the other end of the sleeve being closed andanchored to the cylinder,l a series of normally contacting Q spacingwashers surrounded by and joined to the sleeve, said series beingproportioned to normally fill the sleeve, a heavy protecting fluidextending around the sleeve and outside of the path of fluid whendirected from the inlet to the outlet, and a rod secured to the head andslidable in the washers and the anchored end of the sleeve, said rodconstituting means for holding the washers centered and alined and meansto reciprocate the plunger.

3. A pump including a cylinder having a valved inlet at one end, aplunger rod, a plunger head on the rod and mounted to reciprocatetherewith, a stationary head in the cylinder, a sealed elastic sleeveconnecting said heads, and normally contacting relatively movablewashers surrounded by and connectedto the sleeve, said washers normallyiiiling the sleeve and being movabiy 'mounted on and centered by therod.

CARROLL L. EVANS.

